1985-034A
After the landing of 41-G, Challenger was rolled back to the OPF for processing for the military mission 51-C. When inspectors discovered problems with the heat shield tiles, that high priority mission was reassigned to Discovery, and Challenger was assigned the 51-E payload, consisting of the TDRS B and Anik C-1 satellites. Challenger's first Spacelab mission was 51-B. Launch came on 1985 Apr 29.
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| STS 51-B |
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| Date | Time | Event | Orbit |
|---|
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| 1985 Feb 10 | | 51-E rollover | VAB 1 |
| 1985 Feb 13 | | 51-E mate | VAB 1 |
| 1985 Feb 15 | | 51-E rollout | LC39A |
| 1985 Mar 1 | | 51-E cancelled | LC39A |
| 1985 Mar 4 | | 51-E rollback | LC39A |
| 1985 Mar | | 51-E demate | VAB |
| 1985 Mar 7 | | 51-B to OPF | OPF |
| 1985 Mar 27 | | Spacelab installed |
| 1985 Apr 10 | | 51-B rollover | VAB |
| 1985 Apr 10 | | 51-B mate |
| 1985 Apr 15 | | 51-B rollout | LC39A |
| 1985 Apr 29 | 1602:18 | Launch | LC39A |
| | 1604:24 | SRB sep, 47.8 km |
| | 1610:53 | MECO, 113.6 km |
| | 1611:11 | ET sep, 115.5 km | 86.68 32 x 186 x 57.0 (dV) |
| | 1612:53 | OMS 1 (2:12) 69m/s | 89.02 99 x 353 x 57.0 |
| | | | 89.02 100 x 351 x 57.0 (OMS dV) |
| | 1615:07 | OMS 1 CO |
| | 1632 | ET apogee? |
| | 1648:33 | OMS 2 (2:27) 74m/s |
| | 1650:58 | OMS 2 CO |
| | 1703 | ET reentry 59km |
| | 1727 | PLBD open | 91.59 346 x 358 x 57.0 |
| | 2017 | NUSAT 1 deploy |
| | 2042 | | 91.59 345 x 358 x 57.0 |
| | | GLOMR deploy failed |
| 1985 Apr 30 | 1754 | | 91.58 345 x 359 x 57.0 |
| 1985 May 5 | 0200 | | 91.59 345 x 359 x 57.0 |
| 1985 May 6 | 1228 | PLBD closed | 91.59 345 x 359 x 57.0 |
| | 1504:48 | OMS DO (265s) 143m/s | 347 x 361 x 57.0 |
| | 1509:12 | OMS DO CO |
| | 1540:04 | Entry |
| | 1611:04 | Landing | RW17 EAFB |
| | 1611:16 | NGTD |
| | 1612:03 | Wheels stop |
| 1985 May 10 | | SCA 905 | EAFB |
| 1985 May 10 | | SCA 905 landing | Kelly AFB, TX |
| 1985 May 11 | 1505 | SCA 905 landing | KSC SLF |
| 1985 May 11 | | | OPF |